EP3602838A1 - Procédures de gestion de faisceau pour équipement d'utilisateur et point d'émission et de réception - Google Patents

Procédures de gestion de faisceau pour équipement d'utilisateur et point d'émission et de réception

Info

Publication number
EP3602838A1
EP3602838A1 EP18716804.2A EP18716804A EP3602838A1 EP 3602838 A1 EP3602838 A1 EP 3602838A1 EP 18716804 A EP18716804 A EP 18716804A EP 3602838 A1 EP3602838 A1 EP 3602838A1
Authority
EP
European Patent Office
Prior art keywords
trp
beams
csi
present
rss
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18716804.2A
Other languages
German (de)
English (en)
Inventor
Yuichi Kakishima
Chongning Na
Satoshi Nagata
Kazuaki Takeda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
Original Assignee
NTT Docomo Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Publication of EP3602838A1 publication Critical patent/EP3602838A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams

Definitions

  • the present invention generally relates to a method of beam management in a wireless communication system including a transmission and reception point (TRP) and a user equipment (UE).
  • TRP transmission and reception point
  • UE user equipment
  • CSI Channel State Information
  • the UE performs beam management and CSI acquisition using Resource setting, CSI reporting setting, and Link.
  • Interference measurement resource (IMR) information e.g., CSI-RS resource, the number of antenna ports.
  • IMR Interference measurement resource
  • Time-domain behavior (periodic, aperiodic or semi-persistent), etc.
  • Time-domain behavior (periodic, aperiodic or semi-persistent)
  • Frequency granularity (subband, partial band or wideband)
  • Each CSI parameters are configured on/off
  • CSI types e.g., type I or II
  • Rel. 13 LTE do not support the aforementioned beam management and CSI acquisition schemes using beam pair link control. Furthermore, the beam pair link control is not defined and UE procedures using the beam pair control is not determined in the 3GPP standard.
  • One or more embodiments of the present invention relate to a user equipment
  • UE that includes a receiver that receives one or more RSs transmitted using a first beam from a transmission and reception point (TRP), using at least a second beam, and a processor that determines the first beam paired with the second beam based on reception quality of the RSs.
  • TRP transmission and reception point
  • One or more embodiments of the present invention relate to a TRP a receiver that receives at least a RS transmitted using a first beam from a UE, using at least a second beam; and a processor that determines the first beam paired with the second beam based on reception quality of the RSs.
  • One or more embodiments of the present invention relate to a UE that includes a processor that performs beam management using a beam pair link.
  • the beam pair link is configured as association of a downlink reference signal (RS) and an uplink RS.
  • RS downlink reference signal
  • One or more embodiments of the present invention can perform efficient UE procedures using the beam pair control, which are further enhanced to accommodate much narrower beams compared to legacy systems.
  • FIG. 1 is a diagram showing a configuration of a wireless communication system according to one or more embodiments of the present invention.
  • FIG. 2 is a diagram showing an example of a configuration of a beam pair link according to one or more embodiments of the present invention.
  • FIG. 3 is a diagram showing an example of a configuration of a beam pair link according to one or more embodiments of the present invention.
  • FIG. 4 is a flowchart showing an example of a beam management operation according to one or more embodiments of the present invention.
  • FIG. 5 is a schematic diagram showing an example of a beam management operation according to one or more embodiments of a first example of the present invention.
  • FIG. 6 is a sequence diagram showing an operation example of the beam management operation according to one or more embodiments of the first example of the present invention.
  • FIG. 7 is a schematic diagram showing an example of a beam management operation according to one or more embodiments of a second example of the present invention.
  • FIG. 8 is a sequence diagram showing an operation example of the beam management operation according to one or more embodiments of the second example of the present invention.
  • FIG. 9 is a sequence diagram showing an operation example of the beam management operation according to one or more embodiments of a second modified example of the present invention.
  • FIG. 10 is a schematic diagram showing an example of a beam management operation according to one or more embodiments of a third example of the present invention.
  • FIG. 11 is a sequence diagram showing an operation example of the beam management operation according to one or more embodiments of the third example of the present invention.
  • FIG. 12 is a sequence diagram showing an operation example of the beam management operation according to one or more embodiments of a third modified example of the present invention.
  • FIG. 13 is a schematic diagram showing an example of a beam management operation according to one or more embodiments of a fourth example of the present invention.
  • FIG. 14 is a schematic diagram showing an example of a beam management operation according to one or more embodiments of a fourth modified example of the present invention.
  • FIG. 15 is a schematic diagram showing an example of a beam sweeping operation according to one or more embodiments of a fifth example of the present invention.
  • FIG. 16 is a schematic diagram showing an example of a beam sweeping operation according to one or more embodiments of a fifth example of the present invention.
  • FIG. 17 is a schematic diagram showing an example of a beam sweeping operation according to one or more embodiments of a fifth example of the present invention.
  • FIG. 18 is a flowchart showing an example of a method to determine UE Tx according to one or more embodiments of a sixth example of the present invention.
  • FIG. 19 is a schematic diagram showing an example of a method to determine TRP Tx according to one or more embodiments of a seventh example of the present invention.
  • FIG. 20 is a schematic diagram showing an example of a beam sweeping operation according to one or more embodiments of an eighth example of the present invention.
  • FIG. 21 is a schematic diagram showing an example of a beam sweeping operation according to one or more embodiments of an eighth example of the present invention.
  • FIG. 22 is a schematic diagram showing an example of a beam sweeping operation according to one or more embodiments of an eighth example of the present invention.
  • FIG. 23 is a diagram showing a schematic configuration of the TRP according to one or more embodiments of the present invention.
  • FIG. 24 is a diagram showing a schematic configuration of the UE according to one or more embodiments of the present invention.
  • FIG. 1 is a wireless communications system 1 according to one or more embodiments of the present invention.
  • the wireless communication system 1 includes a user equipment (UE) 10, a transmission and reception point (TRP) 20, and a core network 30.
  • the wireless communication system 1 may be a New Radio (NR) system.
  • the wireless communication system 1 is not limited to the specific configurations described herein and may be any type of wireless communication system such as an LTE/LTE- Advanced (LTE-A) system.
  • LTE-A LTE/LTE- Advanced
  • the TRP 20 may communicate uplink (UL) and downlink (DL) signals with the UE 10 in a cell of the TRP 20.
  • the DL and UL signals may include control information and user data.
  • the TRP 20 may communicate DL and UL signals with the core network 30 through backhaul links 31.
  • the TRP 20 may be referred to as a base station (BS).
  • the TRP 20 may be gNodeB (gNB).
  • the TRP 20 includes antennas, a communication interface to communicate with an adjacent TRP 20 (for example, X2 interface), a communication interface to communicate with the core network 30 (for example, SI interface), and a CPU (Central Processing Unit) such as a processor or a circuit to process transmitted and received signals with the UE 10.
  • Operations of the TRP 20 may be implemented by the processor processing or executing data and programs stored in a memory.
  • the TRP 20 is not limited to the hardware configuration set forth above and may be realized by other appropriate hardware configurations as understood by those of ordinary skill in the art. Numerous TRPs 20 may be disposed so as to cover a broader service area of the wireless communication system 1.
  • the UE 10 may communicate DL and UL signals that include control information and user data with the TRP 20 using Multi Input Multi Output (MIMO) technology.
  • MIMO Multi Input Multi Output
  • the UE 10 may be a mobile station, a smartphone, a cellular phone, a tablet, a mobile router, or information processing apparatus having a radio communication function such as a wearable device.
  • the wireless communication system 1 may include one or more UEs 10.
  • the UE 10 includes a CPU such as a processor, a RAM (Random Access
  • the UE 10 may be implemented by the CPU processing or executing data and programs stored in a memory.
  • the UE 10 is not limited to the hardware configuration set forth above and may be configured with, e.g., a circuit to achieve the processing described below. [0021] (Indication of Beam Pair Link)
  • a beam pair link is a combination of a TRP beam and a UE beam.
  • the combination of the TRP beam and the UE beam includes a combination of a TRP transmission (Tx) beam and a UE reception (Rx) beam in downlink transmission and a combination of a TRP Rx beam and a UE Tx beam in uplink transmission.
  • the BPL may be indicated by association of Channel State Information Reference Signal (CSI-RS) resource and Sounding Reference Signal (SRS) resource.
  • CSI-RS Channel State Information Reference Signal
  • SRS Sounding Reference Signal
  • the BPL may be indicated by a combination of downlink and uplink reference signals (RSs).
  • FIGs. 2 and 3 show configurations of BPLs according to one or more embodiments of the present invention.
  • the TRP 20 uses four beams, TRP beams #l-#4, for signal transmission/reception.
  • the UE 10 uses two beams, UE beams #l-#2, for signal transmission/reception.
  • the number of BPLs may be indicated as the number of TRP beams paired with the UE beam.
  • the number of BPLs is four (BPLs #1-4).
  • the number of BPLs may be indicated as the number of UE beams paired with the TRP beam.
  • the number of BPLs (NUE) is two (BPLs #1-2).
  • the number of BPLs may be indicated as a minimum value of the NTRP and NUE
  • the number of BPLs may be indicated as a maximum value of the NTRP and NUE
  • the number of BPLs may include the NTRP and NUE (NTRP+NUE).
  • the number of BPLs may be indicated as at least one of the NTRP, NUE , min (NTRP, NUE), max (NTRP, NUE), and NTRP+NUE-
  • FIG. 4 is a flowchart showing an example of a beam management operation according to one or more embodiments of a first example of the present invention.
  • the TRP 20 may transmit CSI-RS resource information and/or beam selection information to the UE 10.
  • the CSI-RS resource information includes information explicitly or implicitly indicating the number of CSI-RS resources transmitted from the TRP 20 (the number of TRP Tx beam NTRP).
  • the beam selection information includes information indicating UE assumption for beam selection such as the number of selected beams.
  • the TRP 20 may explicitly notify the UE 10 of the number of
  • TRP Tx beam NTRP used for the CSI-RS transmission TRP Tx beam NTRP used for the CSI-RS transmission.
  • the TRP 20 may implicitly notify the UE 10 of the number of
  • the TRP 20 may transmit the number of CSI-RS resources, the number of CSI-RS resource sets, a Beam ID that identifies each TRP Tx beam, or a virtual cell ID to notify the UE 10 of the number of TRP Tx beam NTRP.
  • information indicating the number of TRP Tx beam NTRP may be set commonly or independently between transmission and reception. If N TRP is used for reception, it may mean the number of candidate Rx beams (or the number of Rx beams capable to be generated) at a TRP side.
  • the CSI-RS resource information includes information of the beam applied to the CSI-RS resource.
  • the TRP 20 may notify the UE 10 of precoding information as Quasi Co-Location (QCL).
  • QCL Quasi Co-Location
  • the TRP 20 may notify the UE 10 of information indicating whether different precoding is applied to multiple CSI-RS resources (e.g., 1 bit information).
  • the TRP 20 may notify the UE 10 of information indicating whether the same precoding is applied to multiple CSI-RS resources (e.g., 1 bit information).
  • the TRP 20 may transmit one or more TRP Tx beams
  • the UE 10 may receive the TRP Tx beam(s) using the UE Rx beams.
  • the UE 10 may determine the TRP Tx beam and/or UE Rx beam for the BPL.
  • the UE 10 may transmit feedback information including information indicating the determined TRP Tx beam and/or UE Rx beam at the step SI 3.
  • TRP Tx beam used for the BPL can be determined. The methods to determine the BPL will be described in detail below. [0040] (First Example)
  • the UE 10 may receive the CSI-RSs using an omni-directional beam (omni-directional antenna).
  • the UE Rx beam may be determined at an antenna connector of the UE 10.
  • the TRP 20 may transmit the CSI-RSs using the TRP Tx beams #l-#4 by beam sweeping.
  • the UE 10 may receive the CSI-RSs from the TRP 20 using the omni-directional beam.
  • FIG. 6 is a sequence diagram showing an operation example of the beam management operation according to one or more embodiments of the first example of the present invention.
  • the TRP 20 may transmit the CSI-RS resource information and/or beam selection information.
  • the CSI-RS resource information includes information indicating the number of TRP Tx beam NTRP and UE Rx beam designation information to designate the UE Rx beam, one or more embodiments of the first example of the present invention, the UE Rx beam designation information may be indicated as the omni-directional beam.
  • the UE Rx beam designation information may be informed as the QCL to designate the UE Rx beam as the omni-directional beam.
  • the UE Rx beam designation information may be informed that there is no QCL between the CSI-RS resource and SS/RS, to designate the UE Rx beam as the omnidirectional beam.
  • the UE Rx beam designation information may be informed as a special case of Sounding Reference Signal (SRS) Resource Indicator (SRI).
  • SRS Sounding Reference Signal
  • SRI Sounding Reference Signal
  • the TRP 20 may transmit the CSI-RS #l-#4 using the TRP Tx beam #l-#4, respectively, by beam sweeping.
  • the UE 10 may receive the CSI-RSs using the omni-directional antenna (omni-directional beam) based on the UE Rx beam designation information.
  • the UE 10 may determine the TRP Tx beam based on reception quality of the CSI-RSs.
  • the UE 10 may transmit feedback information to the TRP 20.
  • the feedback information includes information indicating the determined TRP Tx beam (e.g., CSI-RS Resource Indicator (CRI)), the applied UE Rx beam (e.g., SRI), and beam reception quality (e.g., CSI, Reference Signal Received Power (RSRP), and Received Signal Strength Indicator (RSSI)).
  • the applied UE Rx beam is a UE Rx beam corresponding to the determined TRP Tx beam.
  • the information indicating the applied UE Rx beam (e.g., Rx beam index) may be included in CSI parameters.
  • the RSRP and RSSI may be included in the CSI parameters.
  • the configuration information includes information indicating the number of the selected beam pairs (the number of paired information for feedback).
  • the number of the selected beam pairs may be determined to be single.
  • the number of the selected beam pairs may be determined based on the number of TRP Tx beams.
  • the feedback information includes the best
  • the number of the selected beam pairs may be determined based on the number of UE Rx beams.
  • the feedback information includes the best
  • the number of the selected beam pairs may be designated by the
  • the TRP 20 may designate a value "M".
  • the number of the selected beam pairs may be determined by the
  • the UE 10 may receive the CSI-RSs using a predetermined UE Rx beam (Rx antenna panel or Rx antenna group).
  • the predetermined UE Rx beam may be designated by the TRP 20 or determined by the UE 10.
  • the predetermined UE Rx beam may be at least one.
  • the TRP 20 may transmit the CSI-RSs using the TRP Tx beams #l-#4 by beam sweeping.
  • the UE 10 may receive the CSI-RSs from the TRP 20 using the UE Rx beam #1.
  • FIG. 8 is a sequence diagram showing an operation example of the beam management operation according to one or more embodiments of the second example of the present invention.
  • the UE 10 may transmit UE capability information including UE Rx beam information.
  • the UE Rx beam information includes the number of UE Rx beams and/or the maximum number of UE Rx beams.
  • the UE Rx beam information includes information indicating candidates of the UE Rx beams associated with candidates of the TRP Rx beams. For example, all or part of TRP Tx beams may be common to the UE Rx beams.
  • the number of UE Rx beams of the UE capability information may be common to Tx/Rx or different between Tx and Rx.
  • the number of UE Rx beams of the UE capability information may be indicated as the number of UE Rx digital beams (NUE, D) and the number of UE Rx analogue beams (NUE, A) separately.
  • the number of UE Rx beams may be included in other signals other than the UE capability information, e.g., implicitly signaled as the number of RS resources for mobility.
  • the TRP 20 may transmit the CSI-RS resource information and/or beam selection information.
  • the CSI-RS resource information includes information indicating the number of TRP Tx beam NTRP and UE Rx beam information to designate the UE Rx beam.
  • the TRP 20 may transmit UE Rx beam designation information to designate the UE Rx beam (e.g., UE Rx beam #1).
  • the designated UE Rx beam may be indicated as a Beam index or SRS resource index.
  • the designated UE Rx beam may be notified to the UE 10 as a
  • PMI Precoding Matrix Indicator
  • the designated UE Rx beam may be indicated as an antenna panel index, an antenna group index, or a TXRU index.
  • the UE Rx beam designation information includes information to instruct a fallback to the omni-directional beam.
  • the designated UE Rx beam may be commonly or independently used to receive the multiple TRP Tx beams.
  • the TRP 20 may transmit the CSI-RS #l-#4 using the TRP Tx beam #l-#4, respectively, by beam sweeping.
  • the UE 10 may receive the CSI-RSs using the designated UE Rx beam (e.g., UE Rx beam #1) based on the UE Rx beam designation information.
  • the UE 10 may determine the TRP Tx beam based on reception quality of the CSI-RSs.
  • the UE 10 may transmit the feedback information to the TRP 20.
  • step S206 The operation in the step S206 is the same as that in the step S104 in FIG. 6.
  • the UE 10 may determine the UE Rx beam used to receive the CSI-RSs.
  • FIG. 9 is a sequence diagram showing an operation example of the beam management operation according to one or more embodiments of the second modified example of the present invention. Similar steps in FIG. 9 to steps in FIG. 8 may have the same reference labels.
  • the UE 10 may determine the UE Rx beam used to receive the CSI-RSs (e.g., UE Rx beam #1).
  • the UE Rx beam used to receive the CSI-RSs may be common to multiple TRP Tx beams.
  • the UE 10 may not be allowed to switch the UE Rx beam for each TRP Tx beam.
  • the UE Rx beam used to receive the CSI-RSs may be the same as the UE Rx beam used to receive predetermined physical channels and signals. Furthermore, association of the UE Rx beam used to receive predetermined physical channels and signals with the UE Rx beam used to receive the CSI-RSs may be signaled from the UE 10 to the TRP 20.
  • the UE 10 may determine a fallback to the omni-directional beam.
  • the UE 10 may determine the UE Rx beam used to receive the
  • the CSI-RSs based on QCL information from the TRP 20 and information on beam pair link.
  • the QCL information may be transmitted from the TRP 20 to the UE 10 for each TRP Tx beam or TRP Tx beam group.
  • the QCL information may be common to the TRP Tx beams.
  • the UE 10 may determine the UE Rx beam used to receive the
  • the CSI-RSs based on Beam Index, e.g., CRI, from the TRP 20 and information on beam pair link.
  • the Beam index may be transmitted from the TRP 20 to the UE 10 for each TRP Tx beam or TRP Tx beam group.
  • the Beam Index may be common to the TRP Tx beams.
  • all or part of the above methods to determine the UE Rx beam used to receive the CSI-RSs may be switched based on instructions from the TRP 20 or a core network. For example, when the determined UE Rx beam used to receive the CSI-RSs is not proper, the determined UE Rx beam may be changed to the omni-directional beam as a fallback because the proper TRP Tx beam may not be determined.
  • the UE 10 may receive the CSI-RSs using UE Rx beams switched for each TRP Tx beam.
  • the TRP 20 may transmit the CSI-RSs using the TRP Tx beams #l-#4 by beam sweeping.
  • the UE 10 may receive the CSI-RSs from the TRP 20 using the UE Rx beams #1 and #2 by switching the UE Rx beams.
  • FIG. 11 is a sequence diagram showing an operation example of the beam management operation according to one or more embodiments of the third example of the present invention.
  • the UE 10 may transmit UE capability information including UE Rx beam information.
  • the UE Rx beam information includes the number of UE Rx beams and/or the maximum number of UE Rx beams.
  • the UE Rx beam information includes information indicating candidates of the UE Rx beams associated with candidates of the TRP Rx beams. For example, all or part of TRP Tx beams may be associated with the UE Rx beams.
  • the TRP 20 may transmit information to determine the UE Rx beams for each TRP Tx beam.
  • the TRP 20 may transmit the CSI-RS #l-#4 using the
  • TRP Tx beam #l-#4 respectively, by beam sweeping.
  • the UE 10 may receive the CSI-RSs using TRP Tx beams #l-#4, using UE Rx beam #l-#4, respectively, by switching the UE Rx beams.
  • the UE 10 may determine the TRP Tx beam based on reception quality of the CSI-RSs.
  • An operation at step S306 is the same as the operations at the step S104 and at the step S206.
  • the UE 10 may determine to switch the UE Rx beam used to receive the CSI-RSs.
  • FIG. 12 is a sequence diagram showing an operation example of the beam management operation according to one or more embodiments of the third modified example of the present invention. Similar steps in FIG. 12 to steps in FIG. 11 may have the same reference labels.
  • the UE 10 may determine to switch the
  • the TRP 20 may transmit multiple CSI-RSs and the UE 10 may apply different UE Rx beam to each of the multiple CSI-RSs and select the best UE Rx beam.
  • the TRP 20 may transmit multiple CSI-RS using the omni-directional beam.
  • the same beam may be applied to the multiple CSI-RSs.
  • the UE 10 may perform digital sweeping, the multiple
  • CSI-RS resources may not be necessary.
  • the TRP 20 may transmit information of the beam applied to the CSI-RSs to the UE 10.
  • the information of the applied beam may be notified to the UE 10 as the CRI or QCL.
  • the UE 10 may receive the CSI-RSs using different UE Rx beam.
  • the UE Rx beam applied to each CSI-RS may be different from each other.
  • the UE 10 may determine the best UE Rx beam based on the reception quality of the received CSI-RSs.
  • the UE 10 may apply a digital beam, the number of CSI-
  • RSs may be one.
  • the number of CSI-RSs may be the number of UE Rx analogue beams (NUE, A).
  • the number of candidates of the UE Rx beams when the number of candidates of the UE Rx beams is large, the number of CSI-RSs used to determine the UE Rx beam may increase. Furthermore, when a plurality of UEs 10 use different UE Rx beams, the number of CSI-RSs may be different for each UE 10. As a result, the UE Rx beam may not be efficiently determined.
  • the TRP 20 may limit candidates of the UE Rx beams.
  • the TRP 20 may designate the number of UE Rx beams.
  • the predetermined number of the UE Rx beams may be limited.
  • the predetermined number of the UE Rx beams may be ⁇ 1, 2, 4, 8, 16, 32 ⁇ .
  • the predetermined number of the UE Rx beams may be the number of antenna panels and antennas of the UE 10.
  • the TRP 20 may notify the UE 10 of the predetermined number of the UE Rx beams as an over sampling factor of the number of antenna panels and/or antennas of the UE 10.
  • the TRP 20 may notify the UE 10 of the predetermined number of the UE Rx beams as an over sampling factor on the number which is derived by multiplying the number of antenna panels and antennas per panel of the UE 10.
  • the TRP 20 may limit candidates of the UE Tx beams similar to the limitation of UE Rx beam candidates.
  • the TRP 20 may designate the number of the UE Tx beams.
  • the UE 10 may transmit feedback information including the UE Rx beam information and beam reception quality (e.g., CSI, RSRP, and RSSI).
  • the UE Rx beam information e.g., CSI, RSRP, and RSSI.
  • beam reception quality e.g., CSI, RSRP, and RSSI.
  • the aforementioned technologies e.g., notification of the number of Tx beams from the TRP 20 and the method to select multiple beams
  • the TRP 20 may transmit, to the UE 10, periodic, aperiodic, and/or semi- persistent CSI-RS(s) in accordance with the information element designated in the RS setting.
  • the TRP 20 may transmit multiple CSI-RSs using a single TRP Tx beam (TRP Tx beam #1).
  • the UE 10 may receive the CSI-RSs using different UE Rx beam.
  • the beams to be determined are at most four patterns such as the TRP Tx beam, TRP Rx beam, UE Tx beam, and UE Rx beam.
  • the common beam to Tx/Rx may be applied.
  • FIGs. 15-17 are schematic diagrams showing an example of a beam sweeping operation according to one or more embodiments of a fifth example of the present invention. Operation examples in FIGs. 15-17 uses downlink reference signals, but similar operations may be applied to uplink reference signals.
  • the TRP 20 may transmit TRP Tx beam information to the UE 10.
  • the TRP Tx beam information includes the number of CSI-RS resources (Nail) transmitted from the TRP 20.
  • Nail is 8.
  • the TRP Tx beam information includes the number of TRP Tx beams (Nb) used for the CSI-RS transmission.
  • Nb is 4.
  • the TRP Tx beam information includes the number of repetition of CSI-RS transmission (Nr).
  • Nr is 2.
  • the TRP Tx beam information includes at least two of the number of CSI-RS resources (Nail), the number of TRP Tx beams (Nb), and the number of repetition of CSI-RS transmission (Nr) to configure sweeping information.
  • the TRP 20 may transmit information of orders of beam sweeping to the UE 10.
  • the information of orders of beam sweeping indicates which of the TRP beam and the UE beam is the beam sweeping performed on first.
  • the information of orders of beam sweeping may be notified as the Beam index (CRI) or QCL information.
  • the orders of beam sweeping may be defined in the specification such as 3GPP specification.
  • the UE 10 may transmit feedback information of the beam pair to the TRP 20.
  • the feedback information of the beam pair includes a beam pair having the best reception quality.
  • the feedback information of the beam pair includes beam pairs having the best-M reception quality.
  • the feedback information of the beam pair includes the best UE
  • the feedback information of the beam pair includes the best TRP
  • the UE 10 may assume the different UE Rx beam for each TRP
  • the feedback information of the beam pair includes the different UE Rx beam.
  • the UE 10 may assume an omni-directional beam and a directional beam for each TRP Tx beam.
  • the feedback information of the beam pair includes the assumed omni-directional beam and directional beam.
  • the feedback information of the beam pair includes reception quality (e.g., CSI, RSRP, and/or RSSI) of the beam pair.
  • the beam pair for feedback may be determined based on the CSI.
  • the beam pair for feedback may be determined based on the
  • FIG. 18 is a flowchart showing an example of a method to determine UE Tx according to one or more embodiments of a sixth example of the present invention.
  • the UE 10 may transmit SRS resource information to the TRP 200.
  • the UE 10 may transmit one or more UE Tx beams (SRS(s)) to the TRP 20.
  • the TPR 20 may receive the UE Tx beam(s) using the TPR Rx beams.
  • the TRP 20 may determine the UE Tx beam and/or TRP Rx beam for the BPL.
  • the TRP 20 may transmit feedback information including information indicating the determined UE Tx beam and/or TRP Rx beam at the step S23.
  • the information indicating the determined UE Tx beam may be SRS Resource Indicator (SRI).
  • Tx beam used for the BPL can be determined by the UE Tx beam sweeping and the TRP Rx beam switching.
  • the UE 10 may transmit multiple SRSs and the TRP 20 may apply different TRP Rx beam to each of the multiple SRSs and select the best TRP Rx beam.
  • the UE 10 may transmit multiple SRSs (SRS resources) using a predetermine UE Tx beam (e.g., UE Tx beam #1).
  • SRS resources SRS resources
  • a predetermine UE Tx beam e.g., UE Tx beam #1
  • the same precoding may be applied to the multiple SRS resources.
  • the UE Tx beam applied to the SRSs may be designated by the TRP 20 using the SRI.
  • the predetermine UE Tx beam the omni-directional beam.
  • the TRP 20 may switch the TRP Rx beams and receive the SRSs using the switched TRP Rx beam.
  • the TRP 20 may determine the best TRP Rx beam based on the reception quality of the received SRSs.
  • the TRP 20 may transmit feedback information to the UE 10.
  • the feedback information includes information indicating the determined UE Tx beam and the TRP Tx beam corresponding to the determined UE Tx beam. Furthermore, the feedback information includes information indicating quality information of the determined UE Tx beam and the TRP Tx beam corresponding to the determined UE Tx beam.
  • FIGs. 20-22 are schematic diagrams showing an example of a beam sweeping operation according to one or more embodiments of an eighth example of the present invention.
  • the UE 20 may perform the UE Tx beam sweeping and transmit SRSs and the TRP 20 may perform the TRP Rx beam switching.
  • the TRP 20 may designate the UE Tx beam used for the SRS transmission.
  • a determined BPL in the downlink may be different from a determined BPL in the uplink.
  • the UE 10 may notify the TRP 20 of the determined BPL in the downlink and the UE 10 may notify the TRP 20 of the determined BPL in the uplink.
  • oversampling may be applied to the candidates of the TRP and/or UE beams.
  • oversampling may be applied to the candidates of the TRP and UE beams having odd (or even) numbers (Beam index).
  • Beam index odd (or even) numbers
  • a beam group for the TRP and/or UE beams used for the beam sweeping may be set.
  • FIG. 23 is a diagram illustrating a schematic configuration of the TRP 20 according to one or more embodiments of the present invention.
  • the TRP 20 may include a plurality of antennas (antenna element group) 201, amplifier 202, transceiver (transmitter/receiver) 203, a baseband signal processor 204, a call processor 205 and a transmission path interface 206.
  • User data that is transmitted on the DL from the TRP 20 to the UE 20 is input from the core network 30, through the transmission path interface 206, into the baseband signal processor 204.
  • PDCP Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • HARQ transmission processing scheduling, transport format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing.
  • HARQ transmission processing scheduling, transport format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing.
  • IFFT inverse fast Fourier transform
  • precoding processing precoding processing.
  • the baseband signal processor 204 notifies each UE 10 of control information
  • system information for communication in the cell by higher layer signaling (e.g., RRC signaling and broadcast channel).
  • Information for communication in the cell includes, for example, UL or DL system bandwidth.
  • each transceiver 203 baseband signals that are precoded per antenna and output from the baseband signal processor 204 are subjected to frequency conversion processing into a radio frequency band.
  • the amplifier 202 amplifies the radio frequency signals having been subjected to frequency conversion, and the resultant signals are transmitted from the antennas 201.
  • radio frequency signals are received in each antennas 201, amplified in the amplifier 202, subjected to frequency conversion and converted into baseband signals in the transceiver 203, and are input to the baseband signal processor 204.
  • the baseband signal processor 204 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, and RLC layer and PDCP layer reception processing on the user data included in the received baseband signals. Then, the resultant signals are transferred to the core network 30 through the transmission path interface 206.
  • the call processor 205 performs call processing such as setting up and releasing a communication channel, manages the state of the TRP 20, and manages the radio resources.
  • FIG. 24 is a schematic configuration of the UE 10 according to one or more embodiments of the present invention.
  • the UE 10 has a plurality of UE antennas 101, amplifiers 102, the circuit 103 comprising transceiver (transmitter/receiver) 1031, the controller 104, and an application 105.
  • transceiver transmitter/receiver
  • radio frequency signals received in the UE antennas 101 are amplified in the respective amplifiers 102, and subjected to frequency conversion into baseband signals in the transceiver 1031. These baseband signals are subjected to reception processing such as FFT processing, error correction decoding and retransmission control and so on, in the controller 104.
  • the DL user data is transferred to the application 105.
  • the application 105 performs processing related to higher layers above the physical layer and the MAC layer.
  • broadcast information is also transferred to the application 105.
  • UL user data is input from the application 105 to the controller 104.
  • controller 104 retransmission control (Hybrid ARQ) transmission processing, channel coding, precoding, DFT processing, IFFT processing and so on are performed, and the resultant signals are transferred to each transceiver 1031.
  • the transceiver 1031 the baseband signals output from the controller 104 are converted into a radio frequency band. After that, the frequency-converted radio frequency signals are amplified in the amplifier 102, and then, transmitted from the antenna 101.
  • One or more embodiments of the present invention may be used for each of the uplink and the downlink independently.
  • One or more embodiments of the present invention may be also used for both of the uplink and the downlink in common.
  • the present disclosure mainly described examples of a channel and signaling scheme based on NR, the present invention is not limited thereto.
  • One or more embodiments of the present invention may apply to another channel and signaling scheme having the same functions as NR such as LTE/LTE-A and a newly defined channel and signaling scheme.
  • the present disclosure mainly described examples of channel estimation and CSI feedback scheme based on the CSI-RS, the present invention is not limited thereto.
  • One or more embodiments of the present invention may apply to another synchronization signal, reference signal, and physical channel such as synchronization signal (SS), measurement RS (MRS), mobility RS (MRS), and beam RS (BRS).
  • SS synchronization signal
  • MRS measurement RS
  • MRS mobility RS
  • BRS beam RS
  • the present disclosure mainly described examples of an uplink channel estimation method based on the SRS, the present invention is not limited thereto.
  • One or more embodiments of the present invention may apply to another synchronization signal, reference signal, and physical channel.
  • the signaling according to one or more embodiments of the present invention may be the higher layer signaling such as the RRC signaling and/or the lower layer signaling such as the DCI and the MAC CE.
  • the signaling according to one or more embodiments of the present invention may use a Master Information Block (MIB) and/or a System Information Block (SIB).
  • MIB Master Information Block
  • SIB System Information Block
  • at least two of the RRC, the DCI, and the MAC CE may be used in combination as the signaling according to one or more embodiments of the present invention.
  • the beamformed RS and the beamformed signal may be called the RS and the signal, respectively.
  • the beamformed RS may be referred to as a RS resource.
  • the beam selection may be referred to as resource selection.
  • the Beam Index may be referred to as a resource index (indicator) or an antenna port index.
  • One or more embodiments of the present invention may apply to CSI measurement, channel sounding, beam management, and other beam control scheme such as beam management using the SS.
  • the RB and a subcarrier in the present disclosure may be replaced with each other.
  • a subframe, a symbol, and a slot may be replaced with each other.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un équipement d'utilisateur (UE) comprenant un récepteur qui reçoit au moins un signal de référence (RS) émis en utilisant un premier faisceau issu d'un point d'émission et de réception (TRP), en utilisant au moins un deuxième faisceau, et un processeur qui détermine le premier faisceau apparié au deuxième faisceau en se basant sur la qualité de réception des RS. L'UE comprend en outre un émetteur qui émet des informations de rétroaction indiquant le premier faisceau déterminé. Le deuxième faisceau est un faisceau omnidirectionnel. Le récepteur reçoit, en provenance des TRP, des informations de désignation de faisceau de réception (Rx) indiquant un faisceau Rx pour recevoir les RS, et le deuxième faisceau est le faisceau Rx.
EP18716804.2A 2017-03-23 2018-03-22 Procédures de gestion de faisceau pour équipement d'utilisateur et point d'émission et de réception Withdrawn EP3602838A1 (fr)

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US201762475677P 2017-03-23 2017-03-23
PCT/US2018/023779 WO2018175728A1 (fr) 2017-03-23 2018-03-22 Procédures de gestion de faisceau pour équipement d'utilisateur et point d'émission et de réception

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EP (1) EP3602838A1 (fr)
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US11843554B2 (en) 2023-12-12
JP7022762B2 (ja) 2022-02-18
JP2020516139A (ja) 2020-05-28
US20200287677A1 (en) 2020-09-10
WO2018175728A1 (fr) 2018-09-27
CN110663201A (zh) 2020-01-07

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